尾气循环银法甲醛生产工艺

针对我国银法甲醛生产工艺的不足,江阴市华燕石化机械装备有限公司引进了先进的尾气循环法甲醛生产技术.详细介绍了该技术的工艺流程和工艺特点,以及三废的处理方法.最后将银法和铁钼法的生产工艺和方法进行了比较,突出了尾气循环银法生产甲醛工艺的优点.     

尾气循环银法甲醛生产工艺

针对我国银法甲醛生产工艺的不足,江阴市华燕石化机械装备有限公司引进了先进的尾气循环法甲醛生产技术.详细介绍了该技术的工艺流程和工艺特点,以及三废的处理方法.最后将银法和铁钼法的生产工艺和方法进行了比较,突出了尾气循环银法生产甲醛工艺的优点.     

甲醇循环法甲醛生产新工艺

1当前我国甲醛生产工艺现状 甲醛生产方法主要有银法和铁铝法。铁铝法虽然甲醇单耗低，但投资大、能耗高、催化剂费用高，在我国很少采用。我国甲醛工业生产以银法为主，经过40多年的发展，经历了由浮石银催化剂到电解银催化剂的进步，经历了废热锅炉和尾气锅炉从无到有的进步，经历了蒸发器由水蒸气加热到由热水或热甲醛加热的进步，从而形成了我国经典的银法甲醛设备及流程，即通常所说的传统银法工艺。目前，传统银法工艺甲醇单耗一般为455-470kg／t37％甲醛。对该工艺的研究改进主要在以下几个方面：     

甲醇循环法甲醛生产新工艺

1当前我国甲醛生产工艺现状 甲醛生产方法主要有银法和铁钼法。铁钼法虽然甲醇单耗低，但投资大、能耗高、催化剂费用高，在我国很少采用。我国甲醛工业以银法为主，经过40多年的发展，经历了由浮石银催化剂到电解银催化剂的进步，经历了废热锅炉和尾气锅炉从无到有的进步，经历了蒸发器由水蒸汽加热到由热水或热甲醛加热的进步，从而形成了我国经典的银法甲醛设备及流程，即通常所说的传统银法工艺。目前，     

银法制甲醛生产中问题及解决措施探讨

甲醛是一种重要的基本有机原料,目前我国企业生产甲醛大都选择“银法”工艺。“银法”工艺又被称之为三元气体甲醛生产法和尾气循环法,目前该技术已经逐渐的被完善,但是其中不免还存在着一些问题,例如能耗相对比较高、单耗比较高、催化剂的使用周期以及设备的使用寿命比较短。本文就甲醛生产过程中存在的问题进行探讨,分析研究有效的策略,从而尽量提高甲醛生产的产能。     

浅谈甲醛生产工艺及节能优化设计

本文概述了甲醛生产的两种工艺(银法和铁钼法)的特点,并介绍了甲醛生产过程中反应热、冷凝热及尾气回收利用的措施。最后优化设计出一个节能工艺流程,对甲醛节能生产有一定的现实意义。     

甲醇循环法甲醛生产新工艺

甲醛生产方法主要有银法和铁钼法。铁铝法虽然甲醇单耗低，但投资大、能耗高、催化剂费用高，在我国很少采用。我国甲醛工业以银法为主，经过40多年的发展，经历了由浮石银催化剂到电解银催化剂的进步，经历了废热锅炉和尾气锅炉从无到有的进步，经历了蒸发器由水蒸气加热到由热水或热甲醛加热的进步，从而形成了我国经典的银法甲醛设备及流程，即通常所说的传统银法工艺。     

科莱恩催化剂与无锡熙源合作为银法甲醛工厂提供创新尾气处理解决方案

正科莱恩催化剂业务单元已与无锡熙源工程技术有限公司展开合作,推出面向中国甲醛生产商的创新型可持续性尾气处理解决方案。这一先进的尾气排放控制解决方案结合了无锡熙源的最新技术与科莱恩的高性能EnviCat~?VOC催化剂,专为采用银法工艺的甲醛生产商设计。虽然基于科莱恩新一代FAMAX~? 铁钼基催化剂的生产技术效率更高、效益更优,但目前使用多晶银的传统工艺在中国仍有着广泛的应用。因此,科莱恩和无锡熙源正在加大合作力度,帮助生产商达到最新尾气     

聚甲醛的生产工艺

分别介绍了工业上甲醇氧化生产甲醛的三种方法:银法、铁钼法和甲缩醛催化氧化法,并对其生产工艺比较进行,探讨了各种方法的优缺点;分析了聚甲醛生产的均聚和共聚合成工艺;结合国内外各主要聚甲醛生产公司的生产运行情况,提出发展我国聚甲醛产业的一些建议。     

甲醛下游产品开发利用前景广阔

近年,我国甲醛工业发展迅速,银法甲醛生产技术的主要技术经济指标已达到国际水平,装置规模也走向大型化,最大单套装置能力达到20万t/a.近十年来国内先后从国外引进6套铁钼法甲醛生产工艺.……     

Insect antifeedant properties of anthranoids from the genusVismia

Vismiones and ferruginins, representatives of a new class of lypophilic anthranoids from the genusVismia were found to inhibit feeding in larvae of species ofSpodoptera, Heliothis, and inLocusta migratoria.     

Direct observation of freeze-thaw instability of latex coatings via high pressure freezing and cryogenic SEM

Despite its industrial importance, the subject of freeze-thaw (F/T) stability of latex coatings has not been studied extensively. There is also a lack of fundamental understanding about the process and the mechanisms through which a coating becomes destabilized. High pressure (2100 bar) freezing fixes the state of water-suspended particles of polymer binder and inorganic pigments without the growth of ice crystals during freezing that produce artifacts in direct imaging scanning electron microscopy (SEM) of fracture surfaces of frozen coatings. We show that by incorporating copolymerizable functional monomers, it is possible to achieve F/T stability in polymer latexes and in low-VOC paints, as judged by the microstructures revealed by the cryogenic SEM technique. Particle coalescence as well as pigment segregation in F/T unstable systems are visualized. In order to achieve F/T stability in paints, latex particles must not flocculate and should provide protection to inorganic pigment and extender particles. Because of the unique capabilities of the cryogenic SEM, we are able to separate the effects of freezing and thawing, and study the influence of the rate of freezing and thawing on F/T stability. Destabilization can be caused by either freezing or thawing. A slow freezing process is more detrimental to F/T stability than a fast freezing process; the latter actually preserves suspension stability during freezing. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004 in Chicago, IL. Tied for first place in The John A. Gordon Best Paper Competition.     

Ethanol and (−)-α-Pinene: Attractant Kairomones for Bark and Ambrosia Beetles in the Southeastern US

In 2002–2004, we examined the flight responses of 49 species of native and exotic bark and ambrosia beetles (Coleoptera: Scolytidae and Platypodidae) to traps baited with ethanol and/or (−)-α-pinene in the southeastern US. Eight field trials were conducted in mature pine stands in Alabama, Florida, Georgia, North Carolina, and South Carolina. Funnel traps baited with ethanol lures (release rate, about 0.6 g/day at 25–28°C) were attractive to ten species of ambrosia beetles (Ambrosiodmus tachygraphus, Anisandrus sayi, Dryoxylon onoharaensum, Monarthrum mali, Xyleborinus saxesenii, Xyleborus affinis, Xyleborus ferrugineus, Xylosandrus compactus, Xylosandrus crassiusculus, and Xylosandrus germanus) and two species of bark beetles (Cryptocarenus heveae and Hypothenemus sp.). Traps baited with (−)-α-pinene lures (release rate, 2–6 g/day at 25–28°C) were attractive to five bark beetle species (Dendroctonus terebrans, Hylastes porculus, Hylastes salebrosus, Hylastes tenuis, and Ips grandicollis) and one platypodid ambrosia beetle species (Myoplatypus flavicornis). Ethanol enhanced responses of some species (Xyleborus pubescens, H. porculus, H. salebrosus, H. tenuis, and Pityophthorus cariniceps) to traps baited with (−)-α-pinene in some locations. (−)-α-Pinene interrupted the response of some ambrosia beetle species to traps baited with ethanol, but only the response of D. onoharaensum was interrupted consistently at most locations. Of 23 species of ambrosia beetles captured in our field trials, nine were exotic and accounted for 70–97% of total catches of ambrosia beetles. Our results provide support for the continued use of separate traps baited with ethanol alone and ethanol with (−)-α-pinene to detect and monitor common bark and ambrosia beetles from the southeastern region of the US.     

Methyl 2,4,6-decatrienoates Attract Stink Bugs and Tachinid Parasitoids

Halyomorpha halys (Stål) (Pentatomidae), called the brown marmorated stink bug (BMSB), is a newly invasive species in the eastern USA that is rapidly spreading from the original point of establishment in Allentown, PA. In its native range, the BMSB is reportedly attracted to methyl (E,E,Z)-2,4,6-decatrienoate, the male-produced pheromone of another pentatomid common in eastern Asia, Plautia stali Scott. In North America, Thyanta spp. are the only pentatomids known to produce methyl 2,4,6-decatrienoate [the (E,Z,Z)-isomer] as part of their pheromones. Methyl 2,4,6-decatrienoates were field-tested in Maryland to monitor the spread of the BMSB and to explore the possibility that Thyanta spp. are an alternate host for parasitic tachinid flies that use stink bug pheromones as host-finding kairomones. Here we report the first captures of adult and nymph BMSBs in traps baited with methyl (E,E,Z)-2,4,6-decatrienoate in central Maryland and present data verifying that the tachinid, Euclytia flava (Townsend), exploits methyl (E,Z,Z)-2,4,6-decatrienoate as a kairomone. We also report the unexpected finding that various isomers of methyl 2,4,6-decatrienoate attract Acrosternum hilare (Say), although this bug apparently does not produce methyl decatrienoates. Other stink bugs and tachinids native to North America were also attracted to methyl 2,4,6-decatrienoates. These data indicate there are Heteroptera in North America in addition to Thyanta spp. that probably use methyl 2,4,6-decatrienoates as pheromones. The evidence that some pentatomids exploit the pheromones of other true bugs as kairomones to find food or to congregate as a passive defense against tachinid parasitism is discussed.     

2007～2008年世界塑料工业进展

收集了2007年7月～2008年6月世界塑料工业的相关资料,介绍了2007～2008年国外塑料工业的发展情况,提供了世界塑料产量、消费量及全球各类树脂的需求量及产能情况.按通用热塑性树脂(聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂)、工程塑料(尼龙、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚)、特种工程塑料(聚苯·硫醚、液晶聚合物、聚醚醚酮)、通用热固性树脂(酚醛、聚氨酯、不饱和聚酯树脂、环氧树脂)不同品种的顺序,对树脂的产量、消费量、供需状况及合成工艺、产品应用开发、树脂品种的延伸及应用的进一步扩展等技术作了详细介绍.     

2005～2006年国外塑料工业进展

收集了2005年7月～2006年6月国外塑料工业的相关资料,介绍了2005—2006年国外塑料工业的发展情况。提供了世界塑料产量、消费量及全球各类树脂生产量以及各国塑料制品的进出口情况。作为对比,介绍了中国塑料的生产情况。按通用热塑性树脂（聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂）、工程塑料（聚酰胺、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚）、通用热固性树脂（酚醛、聚氨酯、不饱和树脂、环氧树脂）、特种工程塑料（聚苯硫醚、液晶聚合物、聚醚醚酮）的品种顺序,对树脂的产量、消费量、供需状况及合成工艺、产品开发、树脂品种的延伸及应用的扩展作了详细的介绍。